When it comes to describing the value of something, "bang for the buck" is a popular idiom, but it's not the only one. There are several synonyms that can be used, such as "value for money," "cost-effective," "economical," "worthwhile," and "efficient." Another popular phrase is "more bang for your buck," which emphasizes the idea of getting a greater return on investment. Some other alternatives include "high return on investment," "good deal," "smart buy," and "budget-friendly." Ultimately, the goal of any of these phrases is to convey the idea that one is getting the most benefit possible for the money spent.